Frag ’em in Your Own Backyard With Sauerbraten

“Many first-person shooters focus on multiplayer environmentsm,
but Sauerbraten offers several interesting single-player gaming
modes as well. In the traditional stage-based mode, you start as
Private Stan Sauer, make your way to the big valley, fight hordes
of invading monsters as a one-man army, and conquer the four bases.
The objective in these stages, as in any FPS, is to run around the
maps back and forth, grabbing keys, opening doors, dodging
fireballs, and staying alive in the kill-or-be-killed
environment.”

Complete
Story